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Key Concepts of Virtual Private Networks

Virtual Private Networks claim to solveare three aspects most discussed with respect
majority of the security problems faced byto a VPN technology. Protecting the Privacy
the enterprises. Most of the issues wereof information requires some sort of
related to secure data transfer over theencryption. Private Key encryption and Public
public internet. The internets greatestKey encryption methods are the most common
asset is ubiquity and openness but this ismethods available presently. Private key
its greatest weakness as well. VPN seems toencryption is a bit problematic as the key
have  been  a  solution  to  the  weakness.has to be sent over the internet. Public key
systems provide communication between
Many technologies have come up and claim tounsecured systems and even provide means to
be VPN technologies: SSL VPN, MPLS VPN toexchange of private keys. The disadvantage of
name some. Some basic questions are how do wea public key encryption system is that it
define VPN ? Why do we need a VPN and whatrequires more computation. A balance between
are  the  technologies used in deploying VPN?the two is the best solution. The DES secret
key algorithm and Diffie-Hellman public key
Organizations in the past deployed privatealgorithm can be used in conjunction. The DES
networks like LAN or WAN for their missioncan be used to encrypt the traffic and the
critical applications. A performanceDiffie-Hellman  to  produce  the  secret key.
predictable and secure infrastructure was the
end result. A growing number of businessesInformation should not be altered during the
cannot afford setting up a private networktransit over the internet. Integrity is
and existing networks had to reach out toensured using one-way hash function or
customers to gain a market edge. This is theMessage authentication codes (MAC) or even
area where the internet scores its points.digital  signatures.
Networking basics still present a few
bottlenecks. Bandwidth constraints, securityAuthentication is ensuring the identity of
problems due to increased exposure, threatsthe opposite party in a communication
like spoofing, session hijacking, sniffingprocess. Password protection or digital
and man-in-the-middle attacks have exposedsignatures (X.509 standard) are an ideal
data  in  transit.method. The process is a complex system of
key generation, certification, revocation and
Considering business factors and the riskmanagement. All this is a part of a PKI:
factors and it may frighten you. A newpublic  key  infrastructure.
technology has brought the risks down for
data transit on the internet. Virtual PrivateProtocols
Networks as it is called follows encryption
and tunneling for the secure transfer of dataSeparate technologies can be used to provide
between two ends. It extends trustconfidentiality integrity and authentication.
relationships across the cheaper publicThree widely used VPN security protocols are.
network. Security and predictable
performances  are  a part of this technology.-  IPSec  Protocol
Its  uses  are- Tunneling protocols (PPTP:Point to Point
tunneling protocol, L2TP: Layer2 Tunneling
- Remote users and tele-workers connecting toprotocol  )
their  corporate  server  securely.
-  Socks5
- Linking the offices in an enterprise
networkServices
- Organizations making their e-commerceMany managed VPN services offer Quality of
solutions better by extending infrastructureService guarantees, which can be an excellent
to include partners, suppliers and customers.choice for site-to-site connectivity. VPN is
an end to end communication solution and it
Variety  of  Technologiescannot effect the performance of the middle
network and components. This is the reason
VPN technology has been around for quitefor the QoS guarantees which are basically a
sometime. Present and future of VPN depend onmarketing gimmick by the ISP. Each ISP has
emerging standards that have made it securecontrol over its network only and not the
and reliable. VPN is deployed and marketedentire internet which makes the QoS flawed.
more every passing day. Some products areMission critical performances are still to be
emerging standards while the old are forrealized but security has to an extent been
specific requirements. Each product andmitigated.
technology has it respective strengths and
weakness. Choosing the technology depends onAuthor:vpntools.com, presents a secure
how the problems are addressed and what willalternative to the problems faced on the
be the future trends of the presentinternet. Networking Basics , Future of
technology. Security is the present focus ofVPN, etc ..... are a few of the topics that
most  VPN  technologies.could interest you. Completer end to end
security is achievable and you could find it
Confidentiality, Integrity and Authenticationhere.



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